周期性阵风流作用下通气超空泡的仿真研究

A flow field model is established to obtain the multiphase flow characteristics in a periodic gust flow. The proposed model is verified by comparing with the experimental data. Based on the proposed model, the characteristics of ventilated supercavity in a periodic gust flow are numerically simulated. The results show that the gust generator with periodic oscillation flow placed upstream can produce gust flow in the downstream flow field, and the wavelength of gust flow decreases and its amplitude increases with an increase in frequency; the wavelength and amplitude increase with an increase in flow velocity. Ventilated supercavity in the downstream of flow field is deformed by the gust, and the deformation is more obvious with an increase in frequency. The shape of supercavity is more stable with an increase in flow velocity. The wavelength of gust is equal to the ratio of flow velocity to gust frequency, and the effect of long wave on the shape of supercavity is smaller than that of the short wave. The cavitation number periodically changes by the influence of gust flow, and the mode of gas leakage also changes. The momentum of the supercavity tail increases with an increase in the cavitation number, which affects the mode of gas leakage in the double vortex tube of cavity tail.